package com.itheima.servlet.myservlet;

import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Enumeration;

public class ConfigDemo extends HttpServlet{
    private ServletConfig config;
    @Override
    public void init(ServletConfig config) throws ServletException {
        this.config=config;

    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String encoding = config.getInitParameter("encoding");
        System.out.println(encoding);
        //这里获取的是个枚举
        Enumeration<String> keys = config.getInitParameterNames();
        while(keys.hasMoreElements()){
            String s = keys.nextElement();
            String sValue = config.getInitParameter(s);
            System.out.println(s+"=="+sValue);
        }
        String servletName = config.getServletName();
        System.out.println(servletName);
        ServletContext servletContext = config.getServletContext();
        Object username = servletContext.getAttribute("username");
        System.out.println(username);


    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

    }
}
